CCNA Security (640-554) Portable Command Guide

Chapter 14. VPNs and Cryptology

This chapter covers the following topics:

Virtual Private Networks

• VPN Deployment Modes

Cryptology = Cryptography + Cryptanalysis

• Historical Cryptographic Ciphers

• Modern Substitution Ciphers

• Encryption Algorithms

• Cryptanalysis

Cryptographic Processes in VPNs

• Classes of Encryption Algorithms

• Symmetric Encryption Algorithms

• Asymmetric Encryption Algorithm

• Choosing an Encryption Algorithm

• Choosing an Adequate Key Space

Cryptographic Hashes

• Well-Known Hashing Algorithms

• Hash-Based Message Authentication Code

Digital Signatures

Virtual Private Networks

A virtual private network (VPN) is as an encrypted connection between private networks over a public network such as the Internet.

VPN solutions ...